Resumo

GARCIA, Jorge. Caracterización de la respuesta quimioluminiscente de neutrófilos humanos a la hemolisina alfa de Escherichia coli. Rev. costarric. cienc. méd [online]. 2000, vol.21, n.1-2, pp.31-42. ISSN 0253-2948.

Escherichia coli alpha hemolysin (AH) evoked a luminol-amplified chemiluminescence (CL) response from human polymorphonuclear leukocytes (PMN). Analysis of kinetic parameters of the PMN CL response to AH established similarities with that of PMN to the calcium ionophore A23187. PMN CL responses to both AH and A23187 were equally decreased by preincubating PMN with A63612, a hidroxamic acid derivative and lipooxigenase inhibitor, showing that the CL response to both hemolysin and ionophore share a common mechanism, probably activation of leukotriene synthesis, due to calcium entry into the cells brought about by AH and A23187. In addition, the CL response of PMN to AH was lowered by the hydroxyl radical scavenger dimethyl sulfoxide, further suggesting arachidonate metabolism is involved in the CL response.

Palavras-chave : polymorphonuclear leukocytes; chemiluminescence; alpha hemolysin.